Ranong has a tropical monsoon climate (Köppen climate classificationAm). There is little variation in the temperature throughout the year, although the pre-monsoon months (February to April) are somewhat hotter in the day. However, Ranong's position to the west of the Tenasserim Hills means that the monsoon season's rains are greatly amplified, resulting in torrential rains from May until October, and significant rainfall in the transition months of April and November.

Hot Springs and Raksawarin Park — The temperature of the water in the pools remains constant at 65 °C. There is one place where there is no sulphur. They provide many services such as taking a bath for health, soaking feet, and scalding eggs. This is the most popular tourist spot in Ranong.

Rattanarangsarn Place — King Rama V visited Ranong in 1890. So, Phraya Rattanasetthi (Kor Sim Kong) built this hall for the residence of King Rama V. It is on the hill "Niwest Kiree". King Rama V named this place "Rattanarangsarn".

Ngao Mangrove Forest Research Centre — A UNESCO "world biosphere reserve zone". Its role is to maintain to the mangrove's ecological integrity. Many species of aquatic animals come to the mangrove forest for mating and brooding.

Hat Chan Damri (Chan Damri beach) — A small beach in Paknam Kraburi district. It is near Victoria Point of Myanmar.

Hat Praphat — Hat Praphat is large beach that is paralleled by pine trees. It is at the mouth of canal Kam Phuan, in Amphoe Kapoe.

Hat Bang Ben — Hat Bang Ben is a long sandy beach. It is shaded by pine trees.

Khlong Nakha Wildlife Reserve — A wildlife sanctuary southeast of Ranong. It is in the hills of the Phuket mountain range. This wildlife reserve houses a waterfall known as Namtok Phan Met. This is the place in Thailand where Thai onion plant was discovered. They are harvested in October.

Tham Pra Kha Yang — Several royal insignia and initial letters of famous visitors are inscribed on the walls. A concrete staircase leads to an upper entrance which is reached via a tight squeeze.

Ko Phayam — This island has long white sandy beaches, clear blue sea, and coral reefs. The two main bays are Ao Yai (the sunset bay) and Ao Khao Kwai. The shape is similar to a kangaroo. Small roads without cars, just motorbikes and bicycles. The distance from Ranong is 35 kilometres.